A little late on this, but it's hilarious. The Coast Guard was conducting an exercise on the Potomac River today and CNN thought it was real. Watch them try to shift the blame.

White House Spokesman Robert Gibbs:

“Let’s understand that best I can tell there was reporting based on listening to a police scanner that was not verified, and then it was on television and now we’ve raced back to find out that it’s a training exercise. So I think it appears as if a lot of this might have been avoided,” Gibbs said.

Gibbs told reporters that the Coast Guard was holding a news conference to explain the exercise. “Hopefully CNN will go,” Gibbs quipped. “My only caution would be that before we report things like this, checking would be good.”